Repeating device for phonographs



Seam. 30, 19248 R. w. NICHOLLS REPEATING DEVICE FOR PHONOGRAPHS Filed Feb. 13, 1922 nvwntoz Patent Sept. 30, 1924.

ii i ii. .1

- than ROBERT-W. mcnonts, or PALISADES PARK, NEW annsnr, nssrenon. 'ro eonn sner. 00., E rALIsAnEs PARK, NEW JERSEY, A oo nronn'rxon or NEW JERSEY.

REPEATING' DEVICE FOR PHONOGBAPHS.

Application filed February 13, 1922. Serial No. 536,014.

T 0 all whom it may concern:

Be it known that I, ROBERT W. NionoLLs, a citizen of the United States, and a resident of Palisades Park, county of Bergen, and State of New Jersey, have invented. a new and useful improvement in Repeating Devices for Phonographs, of which the following is a specification.

The object of my invention is to provide a self-contained device of this class which can be used on a phonograph with certainty and convenience and without any change or modification in the phonograph of any kind whatsoever. This object is acromplislwd by my invention, one embodiment of which is hereinafter more particularly set forth.

For a more detailed description of my invention, reference is to be had to the accompanying drawings, forming part hereof,

in which-- Figure 1 is a perspective view of one em bodin'ient of my invention, a portion of a phonograph of the disc type. being shown in dotted lines.

Figure 2 is an enlarged detailed view of a portion of the apparatus.

Figure 3 is a sectional view, taken on the line 33 of Figure 2, looking in the direc tion of the arrows.

'Throughout the various views of the drawings, similar reference characters designate similar parts.

My improved repeating device 1 is mounted on a. record 2 of a phonograph table 3 which has the usual center pin 4 and which is driven in the conventional manner, as by a motor which is not shown. Sound is pro duced in the usual 'way by means of'a needle 5 connected to a sound box 6 which is carried by the tone arm 7 which is pivotally mounted in the usual way. As the phono graph employed is the conventional instrument, further description is unnecessary.-

The repeating device 1 is preferably pressed out of celluloid so as to form a cam disc 8 with a cam groove 9 which runs from approximately. the inner part of a record to the outer part and the ends of this groove are connected by an opening 10 with two laterally extending ends, one 11 running to the inner end of the groove 9 and one 12 connecting with its outer end.

The center of the disc 8 carries a triangular opening 13 which has rounded corners and a depressed edge as indicated by the drawing. This triangular opening has two short and one long side, the latter marked 14 and which is the side remote from the opening 10.

At the extreme outer edge of the disc 8 and near the opening 10 is fixed a post 15 which preferably has an inclined flange 16' added where desired. In the preferred embodiment of my invention there are a number of openings which make the disc 18 lighter and better looking than it would be if solid.

In the preferred embodiment of my invention, there is a peculiar relation between the edge 14 and the pin 15 which will now be described. It will be noted that this edge is not equidistant from the pin 15, but is sloped so that the end nearest the opening 11 is also nearer the pin 15 than the other end. The purpose of this will appear below.

The operation of this repeater is as follows, assuming the parts to be as indicated in Figure 1.

Assuming that the record 2 is turning as indicated by the arrows, the cam disc 8 turns with the same until an edge of the openin 10 egages the needle 5 and then the record is played without interference until the needle 5 reaches the inner end of the opening 10 and passes to the opening 11. As soon as the needle runs by the edge of the opening 10, with which it has-- been in engagement, and passes into the, opening 11, the cam disc 8 will turn with the record 9, and then the needle will rise into the cam groove 9. As soon asitdoes this it begins to drag in this groove and thereby retard the movement of the disc on the record. This retarding causes the center pin of the turn table 3 to engage the edge 14 with increasing tension whereby the pin 15 is locked against the record or turntable, preferably the record and. remains so locked until the needle 5 is at the outer end. of the groove 9. Wren near this outer end the cam plate 8 begins to shift outwardly and the lock is released and as soon as the needle is out of the groove and enters the opening 12, the drag ceases, the cam plate 8 1s entirely released and is placed against the needle at the outer end of the edge 10 and then the'device continues to o erate the same as before and the needle shi s to the inner end of the opening 10, as above described. This cycle of operations is repeated indefinitely with a positive locking of the disc 8 to the record or turn table when the needle 5 enters the groove 9 and a positive release when the needle leaves this groove It the pin 15 is intended to enga e the turn table, it may be necessary to exten it and to place it at a point which is more remote from the pin 4 at the center of the turntable. In the preferred embodiment of my invention this pin 15 engages the record on which rests the cam disc 8.

While I have shown and described one embodiment of my invention, it is obvious that it is not restricted thereto, but that it is broad enough to cover all structures that come within the scope of the annexed claims.

Having thus described my invention, what I claim is:

'1. A repeating attachment for sound reproducing machlnes having the usual turntable with a center pin, a playing stylus and sound record; a disk having therein a triangular opening that is adapted to lie on the record with said openin over the center pin, and an opening, the edge of which engages the stylus to hold the disk stationary during the reproducing operation, a groove in the disk .to guide the needle to startin position after said record has been playe a clutch pin extending below the disk and over the edge of the record, which is adapted to be brought into engagement with said edge when the disk is allowed. to start in rotation and to be released therefrom when the disk is againarrested by engagement with the stylus.

2. A phonograph repeater made of a suitable material and adapted to rest lightly upon the record, said repeater having a slot opening therein one edge of which engages the stylus while reproducing and arrests its rotation, a triangular opening that goes over the center. pin of the turn-table, a oove that extends from one end of the saldslot opening to the other by which the stylus is carried back to the startin point after a record has been played, an a pin which is brought into gripping contact with the edge of the disk by the shifting of the repeater due to the engagement with the center pin of an inclined side of the triangular opening when the repeater is released to rotate and freed from such engagment when the repeater is again arrested b' engagement of the stylus with the e ge of the said slot opening.

- 3. A phonograph repeater consisting of a sheet 0 celluloid adapted to nest hghtly upon a sound record having a substantially radial slot therein for engaging the stylus and arrest-in its movement of rotation during the playmg of the record, a triangular opening that goes over the pin of the turntable, a clutch to engage with the record disk and check its rotation operated by the move nzient of the repeater when released and permitted to start in rotation by disengagementwith thestylus, and a spiral groove connecting the two ends of the'radial slot.

4. In an automatic repeating attachment for sound reproducing machines having the usual turn table spindle, playing stylus, and sound record; a member havin an elongated hole going over the spindle an arranged on the record, means on said member to engage the stylus to hold the member stationary during the reproducing operation, a groove in said member for guiding the needle to starting osition aftei said record has been played, 0 utch means on said member formed to engage the edge of the record, when thestylus enters said groove, and clutch the member to the recordeto rotate therewith, and releasable therefrom when the stylus reengages the first named means.

,In testimony whereof, I have hereunto set my hand this 10th day of Februalrly 1922.

ROBERT W. NIC o is. 

